Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4a6b4a364cde0c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 23:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31a36c3652a660653b23874be36ff3ff SHA-1: aa034a9f0291045c7230aa58f44857126e1d9431 SHA-256: be4a6b4a364cde0c8f2e4511b3cbff7e5509eb6975906b9a3bbeb631bc7c3122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the nature of the embedded links suggests a potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nffcd.org/userfiles/files/54143125714.pdf In PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/jinuruxemugumolumide.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/15686473795.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/pafinonedunodevanoxe.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/forijomawarekileb.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/96778743126.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/1347000584.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/99082791837.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/30607702297.pdfIn PDF document text
    • https://panama4d.com/contents/files/jufodigoxuvajobikabufog.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/vodadu.pdfIn PDF document text
    • http://wwstationery.com/files/file/91403298689.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/84616721333.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134083a26d43---sumodosifitawipor.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342f1a85336---21744064090.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/41147534176.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/wewozukukolibelonupiwuva.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/33600275082.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/zesanatezapenunipaxobefi.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/wirefabew.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/gobiva.pdfIn PDF document text
    • http://teknis.it/userfiles/files/wedagimutefemenepi.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/dejarukutipi.pdfIn PDF document text
    • http://usagimatur.com/files/others/dogeranoxoxoj.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/kigafaxasu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161351efc5b56a---67669120527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=social+wars+game+download+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 11012 bytes
SHA-256: cd61149ef7479bb6b0f1c5ba71d529b3fc7b8d50de30ce737724585256b59c48
font_02_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 20580 bytes
SHA-256: c0c8e5f504c1027f5154edccf401623bb2491fa2691181be8455c70eacee3c86

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